Fixed asset acquisition accounting begins with building a single capitalized cost figure for the asset, choosing the correct valuation approach for how you acquired it, and then deciding whether to recover that cost through depreciation or to expense it in the first year under a safe harbor, Section 179, or bonus depreciation. Every later entry, from depreciation schedules to gain-or-loss calculations on disposal, flows from the number you record on day one.
What Belongs in the Capitalized Cost
Federal tax law requires you to capitalize the costs of acquiring, producing, and improving tangible property regardless of the dollar amount involved.1Internal Revenue Service. Tangible Property Final Regulations GAAP imposes a parallel requirement. The purchase price is only the starting point. To it, you add every direct cost you incur before the asset is operational:
- Transportation and delivery: freight charges, shipping insurance, and handling fees to get the asset to your location.
- Preparation costs: installation labor, testing, necessary modifications, and site work needed before the asset can function.
- Transaction costs: non-refundable sales tax, import duties, and brokerage fees paid at purchase.
- Real-estate-specific costs: legal fees, title insurance, survey costs, and closing costs on real property.
The cutoff is readiness. Once the asset can do its job, routine maintenance and minor repairs are expensed as you incur them rather than added to the asset’s cost. Capitalizing something you should have expensed inflates the balance sheet and understates the period’s expenses; expensing something you should have capitalized does the reverse. Auditors look for both.
When You Can Expense Instead of Capitalize
Not every tangible purchase has to be set up as a fixed asset. The IRS de minimis safe harbor lets you expense low-cost items immediately, avoiding the overhead of tracking them.1Internal Revenue Service. Tangible Property Final Regulations The ceiling depends on whether your business has an applicable financial statement (AFS), generally meaning audited financials or SEC filings:
- With an AFS: up to $5,000 per invoice or per item, provided you have a written accounting policy in place and follow it consistently.
- Without an AFS: $2,500 per invoice or per item.2Internal Revenue Service. Increase in De Minimis Safe Harbor Limit for Taxpayers Without an Applicable Financial Statement
Using the safe harbor requires a formal election on your tax return each year. Buy a $2,000 printer under a $2,500 written policy and the full cost is deducted now, not depreciated over five or seven years. The election applies to all qualifying purchases for the year, so you cannot pick and choose which items to expense and which to capitalize under this rule.
How the Acquisition Method Changes the Entry
A cash purchase is only one way to acquire a fixed asset, and each method sets the recorded cost differently.
Cash Purchases
The capitalized cost equals the cash price plus the ancillary costs listed above. Debit the fixed asset account for the total; credit cash or accounts payable.
Self-Constructed Assets
When your business builds an asset for its own use, the cost basis comes from three buckets: direct materials, direct labor, and a reasonable share of manufacturing overhead. General administrative expenses and selling costs are excluded, but production-related overhead such as factory utilities, equipment depreciation, and supervisory labor tied to the construction must be included.
Interest on borrowed funds used to finance the construction must also be capitalized while the work is in progress. The IRS requires the avoided cost method to determine how much interest to capitalize.3Internal Revenue Service. Interest Capitalization for Self-Constructed Assets That method calculates the interest you could have avoided if the construction spending had instead gone to pay down existing debt.4eCFR. 26 CFR 1.263A-8 – Requirement to Capitalize Interest Interest capitalization stops once the asset is substantially complete and ready for its intended use. Until then, the accumulating costs sit in a construction-in-progress account on the balance sheet.
Lump-Sum Purchases
When you pay one price for multiple assets, common in real estate and business acquisitions, split the total among the individual assets based on their relative fair values. Each asset gets a share of the price proportional to its appraised or estimated fair value compared with the group total. Different asset classes have different depreciation lives and methods, and land is not depreciable at all, so this allocation drives real tax outcomes.
Non-Monetary Exchanges
Trading one asset for another, including trade-ins, turns on whether the exchange has commercial substance, meaning your future cash flows change meaningfully because of the swap. A difference in the risk, timing, or amount of cash flows between the old and new assets generally satisfies that test.
If the exchange has commercial substance, record the new asset at the fair value of what you gave up or what you received, whichever is more clearly measurable, and recognize any gain or loss on the old asset immediately. If the exchange lacks commercial substance, defer any gain and limit the new asset’s recorded cost to the book value of the old asset plus any cash paid. Losses are always recognized immediately regardless of commercial substance.
For tax purposes, like-kind exchange treatment under Section 1031 now applies only to real property. Equipment, vehicles, and other personal property no longer qualify.5Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment Trading in a machine triggers a taxable gain or loss even if you receive similar machinery in return.
When Depreciation Starts
Depreciation does not start when you buy the asset or when you write the check. It starts on the placed-in-service date, which is when the asset is ready and available for a specific use, whether or not you actually begin using it.6Internal Revenue Service. Publication 946 – How To Depreciate Property A machine delivered in December but not installed and operational until February is placed in service in February. A rental property renovated and listed for tenants in July is placed in service in July, even if no tenant moves in until September.
Two things change on that date. Subsequent spending on the asset is evaluated as improvement or repair rather than added to original cost. And any accumulated construction-in-progress balance is transferred into the final fixed asset account, with a journal entry that debits the fixed asset account and credits cash, accounts payable, or construction-in-progress.
MACRS then applies a convention that governs how much depreciation you can claim in the first and last year of the recovery period. Most personal property uses the half-year convention, which treats the asset as if it entered service at the midpoint of the year. If more than 40 percent of your depreciable personal property for the year is placed in service during the last three months of the tax year, you must switch to the mid-quarter convention, which assigns depreciation based on which quarter the asset entered service.7eCFR. 26 CFR 1.168(d)-1 – Half-Year and Mid-Quarter Conventions Nonresidential real property and residential rental property use a mid-month convention instead.
First-Year Expensing Choices
Standard MACRS spreads the cost over several years, but two provisions let you accelerate that recovery, sometimes deducting the entire cost in year one. The decision is one of the most consequential tax choices you make at acquisition.
Section 179
Section 179 lets you elect to deduct the full purchase price of qualifying tangible personal property and certain real property improvements in the year the asset is placed in service. The statute sets a base deduction limit of $2,500,000, with the deduction phasing out dollar-for-dollar once total qualifying property placed in service during the year exceeds $4,000,000.8Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets After inflation adjustments, the 2026 limits are $2,560,000 for the maximum deduction and $4,090,000 for the phase-out threshold.
The Section 179 deduction cannot exceed your taxable business income for the year, so it cannot create or increase a net operating loss. Any excess carries forward. The election is made on Form 4562, and you can choose exactly which assets and how much cost to expense, giving you flexibility to manage taxable income.
Bonus Depreciation
Bonus depreciation works differently. It applies automatically to qualifying new and used property unless you elect out, and it has no dollar ceiling or taxable income limitation. The deduction had been phasing down from 100 percent, but the One Big Beautiful Bill Act restored a permanent 100 percent first-year deduction for qualified property acquired after January 19, 2025.9Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill For assets placed in service in 2026, that means a 100 percent first-year deduction.
Bonus depreciation can create or increase a net operating loss, which is a key difference from Section 179. Many businesses use Section 179 first to manage income precisely, then layer bonus depreciation on top. Others elect out of bonus depreciation to preserve deductions for future high-income years. Land, certain listed property used less than 50 percent for business, and property depreciated under the alternative depreciation system do not qualify for either provision.
Spending After the Asset Is in Service
Every dollar you spend on the asset after it enters service forces the same question: capitalize or expense? The IRS requires you to capitalize subsequent costs only if they result in a betterment, a restoration, or an adaptation of the asset to a new use.1Internal Revenue Service. Tangible Property Final Regulations A betterment fixes a pre-existing defect, physically enlarges the asset, or materially increases its capacity, efficiency, or output. A restoration replaces a major component or substantial structural part, rebuilds the asset to like-new condition after its class life, or restores it from a non-functional state. An adaptation changes the asset’s use to something inconsistent with how you originally placed it in service.
If the work does not meet any of the three tests, it is a deductible repair. Replacing a broken belt on a conveyor is a repair. Replacing the entire motor assembly is likely a restoration that must be capitalized. The line is whether the work maintains the asset’s current condition or fundamentally changes it.
Documentation to Support the Entry
Every component of the capitalized cost needs a paper trail. Without it, depreciation deductions can be disallowed in an audit because you cannot prove what you paid or why the cost was capitalizable.
For purchased assets, keep the vendor purchase agreement, the detailed invoice breaking out asset price, freight, installation, and sales tax, and any contracts with third parties who performed setup or modification work. Real property acquisitions require the closing statement, title documents, and records of legal or survey fees. Self-constructed assets demand more granular records: time sheets for workers who built it, material requisition forms, and the calculations supporting your overhead allocation and interest capitalization. If an auditor asks how you arrived at the capitalized interest figure, you need to show the avoided cost computation, not just the final number.
All of this feeds into a fixed asset ledger, the subsidiary record supporting the fixed asset balance on your general ledger. Each entry ties the total capitalized cost to the asset’s identification number, its in-service date, and its depreciation schedule. That ledger is the single source of truth for every fixed asset the business owns, and the quality of what sits in it is set by the entries you make the day you acquire the asset.